Hibernate自动生成DO手写DAO的注意事项

自动生成DO，手写DAO：

Myeclipse添加Hibernate支持：注意别勾abstract

生成DO：进入MyEclipse的Database Explorer右键要操作的表（注意一定要有主键）点击Hibernate Reverse，其中Id选择native。

手写DAO：

Configuration con = new Configuration().configure();//构造核心类
SessionFactory factory = con.buildSessionFactory();//连接工厂，这里的session相当于JDBC的connection
Session session = factory.openSession();//打开连接

增：思路：insert into tableName where XXX=? and XXX=?

Object objectName = new Object();//新建对象

objectName.setXXX("");//设置插入内容

Transaction trans=session.beginTransaction();//完整事务

session.save(objectName);

trans.commit();//事务提交

session.close();//关闭连接

删：思路：delete from tableName where id=?

Object objectName = new Object();

Transaction trans=session.beginTransaction();

objectName.setId(X); 

session.delete(); 

session.close();

trans.commit();

改：思路：update tableName set XXX=?, XXX=? where id=?

Object objectName = new Object();

Transaction trans=session.beginTransaction();

objectName.setId(X); 

session.update(objectName); 

session.close();

trans.commit();

查：思路：select id as id, XXX as XXX, XXX as XXX from tableName where id=?

Object objectName  = (Object) session.get(Object.class, X);

session.close();

注：查找是不需要使用事务的。